Propelling mechanism for grindstones.



F. SANTUS.

PROPELLING MECHANISM FOR GRINDSTONES.

APPLICATION FILED MAR. I2 1915.

Patented Aug. 31, 1915.

2 SHEETS-SHEEI I.

IIIIIIIIIIIIIIIIIII I I II III m W 770/? M BY IN 1 II I ATTORNEY COLUMBIA PLANonRAmi co.,\vAsmNaTnN. n c.

F. SANTUS.

PROPELLING MECHANISM FOR GRINDSTONES.

APPLICATION FILED MAR. 12. 1915.

2 SHEETS-SHEET 2.

'W/T/VESSfS ATTORNEY COLUMBIA PLANOORAPH c0.. WASHINGTON, n. c

L" To all whom it may concern: 3

Be it known that L'FRANK SAiNTUS, a subject of the Emperor of AustriaHungary, and resident of Flushing, county of Belmont, and State ofjOhio, have invented certain new and useful"Improvements in Propelling Mechanism for Grindstones, of which the followingiis a specification; I

This invention relates broadly to grind stones, and specifically to grindstone driving mechanism.

The primary objectof the invention is to provide agrindstone having associated there: with simple mechanism whereby the same may be readily and conveniently propelled by foot power.

With this and other objects in iew, the invention resides in the features of construction, arrangement of parts and combinations of elements which will hereinafter be fully described, reference being had to the accompanying drawings, in which- Figure 1 is a side elevation of the invention; Fig. 2 is a top plan view of the same; Fig. 3 is a rear end View; and Fig. 4 is a partial side elevation, illustrating, in full lines, the movable parts occupying the limit of their forward positions and, in broken lines, the limit of their rearward positions.

Referring to said drawings, in which like designating characters distinguish like parts throughout the several views1 indicates a table or bench mounted on supporting legs 2. Mounted on said bench point is a pair of supports 3 in or on which is journaled a shaft 4 upon which, between said supports, is mounted a grindstone 5, a

slot 6 of suitable dimensions being provided in said bench through which the under portion of said stone extends.

J ournaled in suitable bearings 7 mounted on the rear end of the bench is a rocker shaft 8 which has fixed thereon a pair of oppositely disposed substantially upright arms 9; and journaled in the upper ends of said arms are trunnions 10 carried by a transversely disposed rocker member 11 which carries at its opposite ends two reversely disposed crank-arms 12. Pivotally connected to said crank-arms are the rear ends of two pitmen 13 whose front ends are pivoted to two reversely disposed cranks 14 fixed 011 the opposite ends of the shaft 4. Rigidly mounted on the front face of the rocker member 11 midway between the ends of the latter is a bracket 15 to which is pivotally connected :Specification of Letters Patent.

at a suitablev smarts tartar WW v PROPELLING MECHANISM FOR: enlnnsrolvnsi the upper, end offa downwardly and forwardly ncl ned rod 16 which is directed through a suitable .slot l7 in. the bench and has its opposite end pivoted to the rear end of a; l evero r treadlel8. Said treadle is pivoted intermediate its ends on a bracket 20 located on the under side of thebench 1 and .has afoot-piece 19 on its flOIltjQIld located within convenient reach of the operator when the latter is seated upon the seat 21 provided at the frontend of the bench.

In practice, a downward and upward rocking movement of the treadle 18 communicates, through the rod or pitman 16, a rearward and forward rocking movement to the rocker member 11, which movement imparts a rotary movement to the grindstone-carrying shaft 4, through the intermediacy of the crankarms 12, pitmen 13 and cranks 14. A parabolic curve is described by the upper end of the pitman 16- in, the movement of the latter, and in order to afford such move ment, the position of the bearings for the trunnions 10 must shift back and forth slightly, as indicated in dotted lines in Fig.

4. Provision for this shifting movement is made by mounting said trunnions in the arms 9 which are located on the rocker shaft 8.

lVhile I have described the invention more or less in detail, it will be readily understood that various changes in the form and arrangement of some of the parts may be resorted to without departing from the spirit or scope of the invention as defined in the appended claims.

What is claimed is '1. The combination with a suitable support, of a shaft for carrying a rotatable element journaled upon said support, cranks carried by the opposite ends of said shaft, a rocker shaft journaled at the rear end of said support, substantially upright arms carried by said rocker shaft, a horizontal rocker member having its ends pivoted in said arms, reversely disposed crank-arms carried by said member, pitmen interposed between said crank arms and the first-mentioned cranks, and footoperated means for imparting a rocking movement to said rocker member.

2. The combination with a suitable support of a shaft for carrying a rotatable element journaled upon said support, cranks carried by the opposite ends of said shaft, a rocker shaft journaled at the rear end of said support, substantially upright arms car- Patented Aug, 31, 1915.. ApplicationfiledMarch12, 1915. siiaiiv 13,988.

ried by said rocker shaft,a horizontal rocker Vmemberi, having its ends pivoted in said arms, reversely disposed crank-arms carried by said member, pitmen interposed between "said crank arms and the first-mentioned cranks, a treadle, and a serles of levers 1nterposed between said treadleand said rocker member'whereby a reciprocating movement imparted to the former communicates a rock ing movement to theolatterr V The combnation with a suitabl e supi port, of afshaft for carrying arotatable element journaled upon said support, cranks Copies of vthis'patent maybeobtained for carried by the "opposite ends of said shaft,

arocker' shaft journaled at the rear end of said support, substantially upright arms carried by said rocker shaft, a horizontal rocker member having its ends pivoted in said arms, reversely disposed crank-arms carried 1 by said member, pitme'n interposed between said crank arms and the first mentioned cranks,-a bracket carried by the rocker mem- V ber, a treadle, and a pitman interposed befive cents each, by addressing the Commissioner of Patents,

' Washington, D. G. 

